WhoWhere? E-mail addresses 
This site allows a user to search for e-mail addresses, phone numbers and addresses, users with the same interest, Internet phones, and classifieds listings. Additionally, users can find government office listings, company home pages, business news, toll-free numbers, yellow pages, and financial information and corporate performance for publicly held U.S. companies based on SEC Edgar filings.
Internet Address Finder
This is a searchable directory of e-mail addresses and Intel Internet Video Phone contacts. Users can also add their own listing to this directory.
Switchboard home page
The Switchboard site contains a searchable directory of people and business e-mail addresses.
Yahoo!'s free e-mail forwarding services page
Yahoo!'s directory of e-mail forwarding and address services.
Domain.com
Domain name registration, Web hosting, e-mail services, domain search, and SEO services.
